Sunday brings just two games to the NFL preseason schedule, but each one features two of last year’s playoff teams and will be nationally televised. Here’s the story line to watch for and a second-half sleeper to monitor in each contest:

Broncos at 49ers

Why you’re watching: Colin Kaepernick might not see extensive work, but it’s still worth tracking how the Broncos’ defense fares against the 49ers’ first-team unit. Denver’s starters held their own in their preseason debut against the Seahawks, but the loss of linebacker Danny Trevathan is significant. Should Von Miller play, he becomes the lead story as he works his way back from last season’s torn ACL.

Second-half sleeper: In his preseason debut, Bruce Ellington didn’t have the breakout play the 49ers expect him to bring to the table. But the fourth-round pick from South Carolina looks poised for his moment to arrive. Even if he can’t earn significant playing time at receiver, his explosiveness should make him an asset on special teams.

Cam Newton returns to action, but will he be the playmaker of old? (Sam Sharpe, USA TODAY Sports)

Chiefs at Panthers

Why you’re watching: Cam Newton returns to game action with the Panthers’ offense, but the initial results might not be appealing. The Panthers’ thinned receiving corps and offensive line will place more of a burden on Newton and the running game. Coach Ron Rivera plans to play Newton for at least the first quarter, but the quarterback shouldn’t be exposed as he recovers from ankle surgery.

Second-half sleeper: Brandon Williams’ development from a former basketball player to an NFL tight end might be ahead of schedule. The second-year pro landed a spot with the Panthers largely based on his raw athleticism, but he had 3 catches for 50 yards and a touchdown last week against the Bills. If Williams can be a reliable backup to Greg Olsen, that’s found money for a Panthers offense in need of legitimate targets.